Sagan's hour-long keynote tribute lecture at the Worlds of Philip Morrison Symposium (Day 2), surveying the Copernican perspective and Morrison's contributions to physics and SETI.

Sagan's lecture at the American Astronomical Society Austin meeting, arguing a joint US-Soviet Mars mission could help avert global conflict; touches on H.G. Wells, Percival Lowell, and science fiction's framing of Mars.

Speech at the 50th rededication of the Eternal Light Peace Memorial, on the escalation of weaponry from Gettysburg to nuclear arsenals and the case for reconciliation.

Stanford's 1993 Bunyan Lecture — a witty examination of human civilization viewed from a cosmic perspective.

The inaugural Thompson Leadership Lecture at IMSA — Sagan on comets and the origin of life, calling the academy 'a gift from the people of Illinois to the human future.'